TRUNK
if (TRUNK(ifv) != NULL)
if (TRUNK(ifv) == NULL) {
if (TRUNK(ifv) == NULL) {
#define PARENT(ifv) (TRUNK(ifv)->parent)
if (TRUNK(ifv) != NULL) { \
if (TRUNK(ifv) != NULL) {
trunk = TRUNK(ifv);
if (TRUNK(ifv) != NULL) {
if (TRUNK(ifv) != NULL)
trunk = TRUNK(ifv);
trunk = TRUNK(ifv);